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英文名称： Risedronate Sodium Tablets

【成份】 

本品主要成份为利塞膦酸钠。 

化学名称： 2-(3-吡啶基)-1-羟基乙烷-1，1-双膦酸单钠盐二倍半水合物。 

化学结构式： 

分子式： C7H10NNaO7P2·2.5H2O

分子量： 350.13

药品服用 

【用法用量】  

一周一片

按照说明书 

【不良反应】 

1、消化系统 可引起上消化道紊乱，表现为吞咽困难、食道炎、食道或胃溃疡，还可以引起腹泻、腹痛、恶心、便秘等； 

2、其他如流感样综合征、头痛、头晕、皮疹、关节痛等。 

【禁忌】以下患者禁用。 

1、已知对本品过敏者； 

2、低钙血症患者； 

3、30分钟内难以坚持站立或端坐位者。 

【注意事项】 

1、服药后2小时内，避免食用高钙食品（例如牛奶或奶制品）以及服用补钙剂或含铝、镁等的抗酸药物。 

2、不宜与阿司匹林或非甾体抗炎药同服。 

3、重度肾功能损害者慎用本品。 

4、饮食中钙、维生素D摄入不足者，应加服这些药品。 

5、勿嚼碎或吸吮本品。 

【孕妇及哺乳期妇女用药】孕妇用药的安全有效性尚未确立，除非疾病本身对母子的危害性更大并无其他更安全药物替代时，才在妊娠期使用本品。 

本品对哺乳婴儿有严重的不良反应，哺乳期妇女应停药或停止哺乳。 

【儿童用药】儿童用药的安全有效性尚未确立。 

【老年用药】临床试验资料表明，老年人和年轻人在服用本品时无安全性和有效性上的差异，但不排除老年人个体对本品具有高敏性。 

【药物相互作用】没有有关本品特殊的药物间相互作用的报道。本品不被代谢，也不诱导或抑制肝细胞色素酶P450。 

钙剂/抗酸剂 

本品与钙剂、抗酸剂以及含二价阳离子的口服制剂同服，会影响本品的吸收。 

激素替代治疗 如运用得当，本品可与激素联合使用。 

阿司匹林/非甾体抗炎药 在5700名病人参加的本品III期临床试验中,31%病人服用阿司匹林，其中24%为规律服用，48%的病人服用了非甾体类抗炎药，其中21%为规律服用，结果显示服用阿司匹林/非甾体抗炎药的病人中，上消化道不良反应的发生率，本品组（24.5%）与安慰剂组（24.8%）相似。 

H2－受体阻滞剂和质子泵抑制剂 在上述同一试验中，21%病人服用了H2－受体阻滞剂和质子泵抑制剂，这些病人中，上消化道副反应的发生率，本品组与安慰剂组相似。 

【药物过量】过量使用可能会引起血钙、磷下降，还会出现低血钙症状。牛奶或含钙的抗酸剂可以减少本品的吸收，洗胃可以清除未吸收的药物，静脉注射钙制剂，可减轻低血钙症状。 

药理作用 

利塞膦酸钠能够与骨中羟磷灰石结合，具有抑制骨吸收的作用。在细胞水平，本品抑制破骨细胞。破骨细胞通常存在于骨表面上，但不具有明显的吸收活性。对大鼠、狗、小猪进行组织形态测定，发现本品可减少骨转换（活化频率，即骨组织重构部位被活化的速率）和骨再塑部位的吸收。 

动物试验提示，本品可抑制骨质疏松模型大鼠和小型猪的破骨细胞，抑制骨吸收。大鼠和小猪分别经口给予本品（按体表面积折算，剂量分别为人用剂量5mg/m2 的4和25倍，计算方法下同），骨量和骨生物力学强度呈剂量依赖性增加，骨密度的增加与骨生物力学强度呈现正相关，对骨结构和骨矿化无明显影响。狗经口给予本品（剂量分别为人用剂量的0.35～1.4倍），可促进骨更新单元水平上的骨平衡。狗经口给予本品1mg/kg/天（约为人用剂量的5倍），可延迟骨折愈合。这种作用与其他二膦酸盐化合物相似，但在0.1mg/ kg/天的剂量下不发生。大鼠本品治疗后对骨骼进行组织检查，结果在高剂量（5mg/kg/天，皮下注射）下也没有影响骨矿化，也未出现骨软化。 

毒理研究 

遗传毒性： 

本品在沙门氏伤寒菌及大肠杆菌体外回复突变试验（Ames试验）、哺乳动物细胞基因突变试验（CHO/HPRT）、大鼠肝细胞程序外DNA合成试验、大鼠骨髓细胞微核试验中未见基因毒性。CHO细胞染色体裂变试验中，浓度达到细胞毒水平时（>675mcg/ml，存活率6%～7%）出现阳性结果，但在细胞存活率达29%的剂量水平时，未发现染色体损伤。 

生殖毒性： 

雌性大鼠经口给予本品16mg/kg/天（按体表面积折算，相当于人用剂量30mg/天的5.2倍，下同），排卵受到抑制；剂量为7mg/kg/天（相当于人用剂量的2.3倍），着床减少。雄性大鼠经口给予本品40mg/kg/天，可见睾丸和附睾萎缩、炎性细胞浸润；大鼠连续13周经口给予本品16mg/kg/天，也可见睾丸萎缩；犬连续13周经口给予本品8mg/kg/天（相当于人用剂量的8倍），可见中度至重度的精子生成障碍。这些变化随给药剂量的增加和给药时间延长而趋严重。 

妊娠期大鼠经口给予本品，剂量≥16mg/kg/天（相当于人用剂量的5.2倍）时，胎鼠成活率降低；在80mg/kg/天的剂量下，胎仔体重下降；在7.1mg/kg/天剂量下，见胸骨或颅骨骨化数明显增高；在≥16mg/kg/天剂量下，胸骨未骨化或骨化不完全均明显增加；在≥3.2mg/kg/天剂量下，可见胚胎腭裂发生率下降，但该发现与临床的相关性尚不清楚。妊娠家兔经口给予本品，剂量达10mg/kg/天（相当于人用剂量的6.7倍）时，未发现对胚胎骨化产生影响，但14窝中有1窝流产，另外1窝早产分娩。 

与其他二膦酸类化合物类似，大鼠在交配期与妊娠期给药，剂量低至3.2mg/kg/天（相当于人用剂量的1倍）可致亲代动物分娩期低血钙症和死亡。此外，本品能在大鼠乳汁中分泌。 

致癌性：在104周的致癌研究中，大鼠经口给予本品达24mg/kg/天，未发现明显因药物引起的肿瘤。试验中，雄鼠高剂量组（24mg/kg/天）因毒性反应较大，于第93周时停止试验。在大鼠80周的致癌研究中，本品给药剂量达32mg/kg/天时未发现明显因药物引起的肿瘤。 

【药代动力学】据文献报道，本品的药代动力学特点如下： 

吸收 本品口服后由上消化道迅速吸收，血药浓度达峰时间（Tmax）约为服药后1小时，在一定剂量范围内（单剂量给药：2.5～30mg、多剂量给药：2.5～5mg），吸收呈剂量依赖性。连续用药57天内可达到稳态血浆浓度。利塞膦酸钠片的平均绝对口服生物利用度为0.63%（90%置信限：0.54%～ 0.75%），与食物同服时生物利用度降低。与空腹给药相比，早餐前半小时或晚餐后2小时给药，吸收减少55%；早餐前1小时给药，吸收减少30%。本品在早餐前至少30分钟给药是有效的。 

分布 人体平均稳态分布容积为6.3L/kg。人血浆蛋白结合率约为24%。给大鼠和狗静脉注射单剂量14C标记的本品，吸收量的大约60%分布到骨组织，其余随尿液排出，软组织分布极少，大鼠经多次灌胃后，大约有0.001%～0.01%的本品分布到软组织。 

代谢 本品在体内无明显代谢。 

清除 口服给药后，吸收量的约一半在24小时内随尿排出，未吸收的药物以原型随粪便排出。其平均肾清除率为105ml/分，与肌酐清除率之间呈线性关系，而无剂量依赖性。终末半衰期（t1/2）达480h，代表本品从骨组织的解离速率。 

特殊人群的药代动力学 

儿童 本品尚未在18岁以下患者中进行药代动力学研究。 

性别 本品的口服生物利用度和药代动力学基本上没有性别差异。 

老年 老年患者（>60岁）和年轻患者具有相似的生物利用度，因此老年患者不需调整剂量。 

肾功能不全 本品主要以原形经肾排泄。与肾功能正常的人相比，肌酐清除率约为30ml/分的患者，本品的肾清除率约减少70%。严重肾功能损害（肌酐清除率<30ml/分）的患者慎用本品。肌酐清除率≥30ml/分的患者不需要调整剂量。 

肝功能不全 尚未在肝功能损害的患者中评价过本品的安全性和有效性。 

 

ACTONEL®
(risedronate sodium) Tablets

DESCRIPTION

ACTONEL (risedronate sodium) tablets is a pyridinyl bisphosphonate that inhibits osteoclast-mediated bone resorption and modulates bone metabolism. Each ACTONEL tablet for oral administration contains the equivalent of 5, 30, 35, 75, or 150 mg of anhydrous risedronate sodium in the form of the hemipentahydrate with small amounts of monohydrate. The empirical formula for risedronate sodium hemipentahydrate is C7H10NO7P2Na •2.5 H2O. The chemical name of risedronate sodium is [1-hydroxy-2- (3-pyridinyl)ethylidene]bis[phosphonic acid] monosodium salt. The chemical structure of risedronate sodium hemi-pentahydrate is the following:

Risedronate sodium is a fine, white to off-white, odorless, crystalline powder. It is soluble in water and in aqueous solutions, and essentially insoluble in common organic solvents.

Inactive Ingredients

All Dose Strengths Contain:

crospovidone, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, silicon dioxide, titanium dioxide.

Dose Strength-Specific Ingredients Include:

5 mg - ferric oxide yellow, lactose monohydrate; 30 mg - lactose monohydrate; 35 mg - ferric oxide red, ferric oxide yellow, lactose monohydrate; 75 mg - ferric oxide red; 150 mg - FD&C blue #2 aluminum lake.

Indications

INDICATIONS

Postmenopausal Osteoporosis

ACTONEL is indicated for the treatment and prevention of osteoporosis in postmenopausal women. In postmenopausal women with osteoporosis, ACTONEL reduces the incidence of vertebral fractures and a composite endpoint of nonvertebral osteoporosis-related fractures [see Clinical Studies].

Osteoporosis In Men

ACTONEL is indicated for treatment to increase bone mass in men with osteoporosis.

Glucocorticoid-Induced Osteoporosis

ACTONEL is indicated for the treatment and prevention of glucocorticoid-induced osteoporosis in men and women who are either initiating or continuing systemic glucocorticoid treatment (daily dosage of greater than or equal to 7.5 mg of prednisone or equivalent) for chronic diseases. Patients treated with glucocorticoids should receive adequate amounts of calcium and vitamin D.

Paget’s Disease

ACTONEL is indicated for treatment of Paget’s disease of bone in men and women.

Important Limitations Of Use

The optimal duration of use has not been determined. The safety and effectiveness of ACTONEL for the treatment of osteoporosis are based on clinical data of three years duration. All patients onbisphosphonate therapy should have the need for continued therapy re-evaluated on a periodic basis. Patients at low-risk for fracture should be considered for drug discontinuation after 3 to 5 years of use. Patients who discontinue therapy should have their risk for fracture re-evaluated periodically.

Dosage

DOSAGE AND ADMINISTRATION

Treatment Of Postmenopausal Osteoporosis

[see INDICATIONS AND USAGE]

The recommended regimen is:

· one 5 mg tablet orally, taken daily
or

· one 35 mg tablet orally, taken once-a-week
or

· one 75 mg tablet orally, taken on two consecutive days for a total of two tablets each month
or

· one 150 mg tablet orally, taken once-a-month

Prevention Of Postmenopausal Osteoporosis

[see INDICATIONS AND USAGE]

The recommended regimen is:

· one 5 mg tablet orally, taken daily
or

· one 35 mg tablet orally, taken once-a-week
or

· alternatively, one 75 mg tablet orally, taken on two consecutive days for a total of two tablets each month may be considered
or

· alternatively, one 150 mg tablet orally, taken once-a-month may be considered

Treatment To Increase Bone Mass In Men With Osteoporosis

[see INDICATIONS AND USAGE]

The recommended regimen is:

· one 35 mg tablet orally, taken once-a-week

Treatment And Prevention Of Glucocorticoid-Induced Osteoporosis

[see INDICATIONS AND USAGE]

The recommended regimen is:

· one 5 mg tablet orally, taken daily

Treatment Of Paget’s Disease

[see INDICATIONS AND USAGE]

The recommended treatment regimen is 30 mg orally once daily for 2 months. Retreatment may be considered (following post-treatment observation of at least 2 months) if relapse occurs, or if treatment fails to normalize serum alkaline phosphatase. For retreatment, the dose and duration of therapy are the same as for initial treatment. No data are available on more than 1 course of retreatment.

Important Administration Instructions

Instruct patients to do the following:

· Take ACTONEL at least 30 minutes before the first food or drink of the day other than water, and before taking any oral medication or supplementation, including calcium, antacids, or vitamins to maximize absorption and clinical benefit, [see DRUG INTERACTIONS]. Avoid the use of water with supplements, including mineral water, because they may have a higher concentration of calcium.

· Swallow ACTONEL tablets whole with a full glass of plain water (6 to 8 ounces). Avoid lying down for 30 minutes after taking the medication [see WARNINGS AND PRECAUTIONS]. Do not chew or suck the tablet because of a potential for oropharyngeal ulceration.

· Do not eat or drink anything except plain water, or take other medications for at least 30 minutes after taking ACTONEL.

Recommendations For Calcium And Vitamin D Supplementation

Instruct patients to take supplemental calcium and vitamin D if their dietary intake is inadequate; and to take calcium supplements, antacids, magnesium-based supplements or laxatives, and iron preparations at a different time of the day as they interfere with the absorption of ACTONEL.

Administration Instructions For Missed Doses

Instruct patients about missing ACTONEL doses as follows:

· If a dose of ACTONEL 35 mg once-a-week is missed:

o Take 1 tablet on the morning after they remember and return to taking 1 tablet once-a-week, as originally scheduled on their chosen day.

o Do not take 2 tablets on the same day.

· If one or both tablets of ACTONEL 75 mg on two consecutive days per month are missed, and the next month’s scheduled doses are more than 7 days away:

o If both tablets are missed, take one ACTONEL 75 mg tablet in the morning after the day it is remembered and then the other tablet on the next consecutive morning.

o If only one ACTONEL 75 mg tablet is missed, take the missed tablet in the morning after the day it is remembered

o Return to taking their ACTONEL 75 mg on two consecutive days per month as originally scheduled.

o Do not take more than two 75 mg tablets within 7 days.

· If one or both tablets of ACTONEL 75 mg on two consecutive days per month are missed, and the next month's scheduled doses are within 7 days:

o Wait until their next month’s scheduled doses and then continue taking ACTONEL 75 mg on two consecutive days per month as originally scheduled.

· If the dose of ACTONEL 150 mg once-a-month is missed, and the next month’s scheduled dose is more than 7 days away:

o Take the missed tablet in the morning after the day it is remembered and then return to taking their ACTONEL 150 mg once-a-month as originally scheduled.

o Do not take more than one 150 mg tablet within 7 days.

· If the dose of ACTONEL 150 mg once-a-month is missed, and the next month's scheduled dose is within 7 days:

o Wait until their next month’s scheduled dose and then continue taking ACTONEL 150 mg oncea- month as originally scheduled.

HOW SUPPLIED

Dosage Forms And Strengths

· 5 mg film-coated, oval, yellow tablet with RSN on 1 face and 5 mg on the other.

· 30 mg film-coated, oval, white tablet with RSN on 1 face and 30 mg on the other.

· 35 mg film-coated, oval, orange tablet with RSN on 1 face and 35 mg on the other.

· 75 mg film-coated, oval, pink tablet with RSN on 1 face and 75 mg on the other.

· 150 mg film-coated, oval, blue tablet with RSN on 1 face and 150 mg on the other.

Storage And Handling

ACTONEL® is available as follows:

5 mg film-coated, oval, yellow tablets with RSN on 1 face and 5 mg on the other.
NDC 0430-0471-15 bottle of 30

30 mg film-coated, oval, white tablets with RSN on 1 face and 30 mg on the other.
NDC 0430-0470-15 bottle of 30

35 mg film-coated, oval, orange tablets with RSN on 1 face and 35 mg on the other.
NDC 0430-0472-03 dose pack of 4
NDC 0430-0472-07 dose pack of 12

75 mg film-coated, oval, pink tablets with RSN on 1 face and 75 mg on the other.
NDC 0430-0477-02 dose pack of 2

150 mg film-coated, oval, blue tablets with RSN on 1 face and 150 mg on the other.
NDC 0430-0478-01 dose pack of 1
NDC 0430-0478-02 dose pack of 3

Store at controlled room temperature 20° to 25° C (68° to 77° F) [see USP].

Manufactured by: Warner Chilcott Company, LLC. Manati, Puerto Rico 00674. Revised: Apr 2015

Side Effects

SIDE EFFECTS

Clinical Studies Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Treatment Of Postmenopausal Osteoporosis

Daily Dosing

The safety of ACTONEL 5 mg once daily in the treatment of postmenopausal osteoporosis was assessed in four randomized, double-blind, placebo-controlled multinational trials of 3232 women aged 38 to 85 years with postmenopausal osteoporosis. The duration of the trials was up to three years, with 1619 patients exposed to placebo and 1613 patients exposed to ACTONEL 5 mg. Patients with preexisting gastrointestinal disease and concomitant use of non-steroidal anti-inflammatory drugs, proton pump inhibitors, and H antagonists were included in these clinical trials. All women received 1000 mg of elemental calcium plus vitamin D supplementation up to 500 international units per day if their 25- hydroxyvitamin D level was below normal at baseline.

The incidence of all-cause mortality was 2.0% in the placebo group and 1.7% in the ACTONEL 5 mg daily group. The incidence of serious adverse events was 24.6% in the placebo group and 27.2% in the ACTONEL 5 mg group. The percentage of patients who withdrew from the study due to adverse events was 15.6% in the placebo group and 14.8% in the ACTONEL 5 mg group. The most common adverse reactions reported in greater than 10 percent of subjects were: back pain, arthralgia, abdominal pain and dyspepsia. Table 1 lists adverse events from the Phase 3 postmenopausal osteoporosis trials reported in greater than or equal to 5% of patients. Adverse events are shown without attribution of causality.

Table 1: Adverse Events Occurring at a Frequency greater than or equal to 5% in Either Treatment Group Combined Phase 3 Postmenopausal Osteoporos is Treatment Trials

Gastrointestinal Adverse Events

The incidence of adverse events in the placebo and ACTONEL 5 mg daily groups were: abdominal pain (9.9% versus 12.2%), diarrhea (10.0% versus 10.8%), dyspepsia (10.6% versus 10.8%), and gastritis(2.3% versus 2.7%). Duodenitis and glossitis have been reported uncommonly in the ACTONEL 5 mg daily group (0.1% to 1%). In patients with active upper gastrointestinal disease at baseline, the incidence of upper gastrointestinal adverse events was similar between the placebo and ACTONEL 5 mg daily groups.

Musculoskeletal Adverse Events

The incidence of adverse events in the placebo and ACTONEL 5 mg daily groups were: back pain (26.1% versus 28.0%), arthralgia (22.1% versus 23.7%), myalgia (6.2% versus 6.7%), and bone pain (4.8% versus 5.3%).

Laboratory Test Findings

Throughout the Phase 3 studies, transient decreases from baseline in serum calcium (less than 1%) and serum phosphate (less than 3%) and compensatory increases in serum PTH levels (less than 30%) were observed within 6 months in patients in osteoporosis clinical trials treated with ACTONEL 5 mg once daily. There were no significant differences in serum calcium, phosphate, or PTH levels between placebo and ACTONEL 5 mg once daily at 3 years. Serum calcium levels below 8 mg/dL were observed in 18 patients, 9 (0.5%) in each treatment arm (placebo and ACTONEL 5 mg once daily). Serum phosphorus levels below 2 mg/dL were observed in 14 patients, 3 (0.2%) treated with placebo and 11 (0.6%) treated with ACTONEL 5 mg once daily. There have been rare reports (less than 0.1%) of abnormal liver function tests.

Endoscopic Findings

In the ACTONEL clinical trials, endoscopic evaluation was encouraged in any patient with moderate-to-severe gastrointestinal complaints, while maintaining the blind. Endoscopies were performed on equal numbers of patients between the placebo and treated groups [75 (14.5%) placebo; 75 (11.9%) ACTONEL]. Clinically important findings (perforations, ulcers, or bleeding) among this symptomatic population were similar between groups (51% placebo; 39% ACTONEL).

Once-A-Week Dosing

The safety of ACTONEL 35 mg once-a-week in the treatment of postmenopausal osteoporosis was assessed in a 1-year, double-blind, multicenter study comparing ACTONEL 5 mg daily and ACTONEL 35 mg once-a-week in postmenopausal women aged 50 to 95 years. The duration of the trials was one year, with 480 patients exposed to ACTONEL 5 mg daily and 485 exposed to ACTONEL 35 mg oncea- week. Patients with pre-existing gastrointestinal disease and concomitant use of non-steroidal antiinflammatory drugs, proton pump inhibitors, and H2 antagonists were included in these clinical trials. All women received 1000 mg of elemental calcium plus vitamin D supplementation up to 500 international units per day if their 25-hydroxyvitamin D3 level was below normal at baseline.

The incidence of all-cause mortality was 0.4% in the ACTONEL 5 mg daily group and 1.0% in the ACTONEL 35 mg once-a-week group. The incidence of serious adverse events was 7.1% in the ACTONEL 5 mg daily group and 8.2% in the ACTONEL 35 mg once-a-week group. The percentage of patients who withdrew from the study due to adverse events was 11.9% in the ACTONEL 5 mg daily group and 11.5% in the ACTONEL 35 mg once-a-week group. The overall safety and tolerability profiles of the two dosing regimens were similar.

Gastrointestinal Adverse Events:

The incidence of gastrointestinal adverse events was similar between the ACTONEL 5 mg daily group and the ACTONEL 35 mg once-a-week group: dyspepsia (6.9% versus 7.6%), diarrhea (6.3% versus 4.9%), and abdominal pain (7.3% versus 7.6%).

Musculoskeletal Adverse Events:

Arthralgia was reported in 11.5% of patients in the ACTONEL 5 mg daily group and 14.2% of patients in the ACTONEL 35 mg once-a-week group. Myalgia was reported by 4.6% of patients in the ACTONEL 5 mg daily group and 6.2% of patients in the ACTONEL 35 mg once-a-week group.

Laboratory Test Findings:

The mean percent changes from baseline at 12 months were similar between the ACTONEL 5 mg daily and ACTONEL 35 mg once-a-week groups, respectively, for serum calcium (0.4% versus 0.7%), phosphate (-3.8% versus -2.6%) and PTH (6.4% versus 4.2%).

Monthly Dosing

Two Consecutive Days per Month

The safety of ACTONEL 75 mg administered on two consecutive days per month for the treatment of postmenopausal osteoporosis was assessed in a double-blind, multicenter study in postmenopausal women aged 50 to 86 years. The duration of the trial was two years; 613 patients were exposed to ACTONEL 5 mg daily and 616 were exposed to ACTONEL 75 mg two consecutive days per month. Patients with pre-existing gastrointestinal disease and concomitant use of non-steroidal antiinflammatory drugs, proton pump inhibitors, and H2 antagonists were included in this clinical trial. All women received 1000 mg of elemental calcium plus 400 to 800 international units of vitamin D supplementation per day.

The incidence of all-cause mortality was 1.0% for the ACTONEL 5 mg daily group and 0.5% for the ACTONEL 75 mg two consecutive days per month group. The incidence of serious adverse events was 10.8% in the ACTONEL 5 mg daily group and 14.4% in the ACTONEL 75 mg two consecutive days per month group. The percentage of patients who withdrew from treatment due to adverse events was 14.2% in the ACTONEL 5 mg daily group and 13.0% in the ACTONEL 75 mg two consecutive days per month group. The overall safety and tolerability profiles of the two dosing regimens were similar.

Acute Phase Reactions:

Symptoms consistent with acute phase reaction have been reported with bisphosphonate use. The overall incidence of acute phase reaction was 3.6% of patients on ACTONEL 5 mg daily and 7.6% of patients on ACTONEL 75 mg two consecutive days per month. These incidence rates are based on reporting of any of 33 acute phase reaction-like symptoms within 5 days of the first dose. Fever or influenza-like illness with onset within the same period were reported by 0.0% of patients on ACTONEL 5 mg daily and 0.6% of patients on ACTONEL 75 mg two consecutive days per month.

Gastrointestinal Adverse Events:

The ACTONEL 75 mg two consecutive days per month group resulted in a higher incidence of discontinuation due to vomiting (1.0% versus 0.2%) and diarrhea (1.0% versus 0.3%) compared to the ACTONEL 5 mg daily group. Most of these events occurred within a few days of dosing.

Ocular Adverse Events:

None of the patients treated with ACTONEL 75 mg two consecutive days per month reported ocularinflammation such as uveitis, scleritis, or iritis; 1 patient treated with ACTONEL 5 mg daily reported uveitis.

Laboratory Test Findings:

When ACTONEL 5 mg daily and ACTONEL 75 mg two consecutive days per month were compared in postmenopausal women with osteoporosis, the mean percent changes from baseline at 24 months were 0.2% and 0.8% for serum calcium, -1.9% and -1.3% for phosphate, and - 10.4% and -17.2% for PTH, respectively. Compared to the ACTONEL 5 mg daily group, ACTONEL 75 mg two consecutive days per month resulted in a slightly higher incidence of hypocalcemia at the end of the first month of treatment (4.5% versus 3.0%). Thereafter, the incidence of hypocalcemia with these regimens was similar at approximately 2%.

Once-A-Month

The safety of ACTONEL 150 mg administered once-a-month for the treatment of postmenopausal osteoporosis was assessed in a double-blind, multicenter study in postmenopausal women aged 50 to 88 years. The duration of the trial was one year, with 642 patients exposed to ACTONEL 5 mg daily and 650 exposed to ACTONEL 150 mg once-a-month. Patients with pre-existing gastrointestinal disease and concomitant use of non-steroidal anti-inflammatory drugs, proton pump inhibitors, and H2 antagonists were included in this clinical trial. All women received 1000 mg of elemental calcium plus up to 1000 international units of vitamin D supplementation per day.

The incidence of all-cause mortality was 0.5% for the ACTONEL 5 mg daily group and 0.0% for the ACTONEL 150 mg once-a-month group. The incidence of serious adverse events was 4.2% in the ACTONEL 5 mg daily group and 6.2% in the ACTONEL 150 mg once-a-month group. The percentage of patients who withdrew from treatment due to adverse events was 9.5% in the ACTONEL 5 mg daily group and 8.6% in the ACTONEL 150 mg once-a-month group. The overall safety and tolerability profiles of the two dosing regimens were similar.

Acute Phase Reactions:

Symptoms consistent with acute phase reaction have been reported with bisphosphonate use. The overall incidence of acute phase reaction was 1.1% in the ACTONEL 5 mg daily group and 5.2% in the ACTONEL 150 mg once-a-month group. These incidence rates are based on reporting of any of 33 acute phase reaction-like symptoms within 3 days of the first dose and for a duration of 7 days or less. Fever or influenza-like illness with onset within the same period were reported by 0.2% of patients on ACTONEL 5 mg daily and 1.4% of patients on ACTONEL 150 mg once-a-month.

Gastrointestinal Adverse Events:

A greater percentage of patients experienced diarrhea with ACTONEL 150 mg once-a-month compared to 5 mg daily (8.2% versus 4.7%, respectively). The ACTONEL 150 mg once-a-month group resulted in a higher incidence of discontinuation due to abdominal pain upper (2.5% versus 1.4%) and diarrhea (0.8% versus 0.0%) compared to the ACTONEL 5 mg daily regimen. All of these events occurred within a few days of the first dose. The incidence of vomiting that led to discontinuation was the same in both groups (0.3% versus 0.3%).

Ocular Adverse Events:

None of the patients treated with ACTONEL 150 mg once-a-month reported ocular inflammation such as uveitis, scleritis, or iritis; 2 patients treated with ACTONEL 5 mg daily reported iritis.

Laboratory Test Findings:

When ACTONEL 5 mg daily and ACTONEL 150 mg once-a-month were compared in postmenopausal women with osteoporosis, the mean percent changes from baseline at 12 months were 0.1% and 0.3% for serum calcium, -2.3% and -2.3% for phosphate, and 8.3% and 4.8% for PTH, respectively. Compared to the ACTONEL 5 mg daily regimen, ACTONEL 150 mg once-a-month resulted in a slightly higher incidence of hypocalcemia at the end of the first month of treatment (0.2% versus 2.2%). Thereafter, the incidence of hypocalcemia with these regimens was similar at approximately 2%.

Prevention Of Postmenopausal Osteoporosis

Daily Dosing

The safety of ACTONEL 5 mg daily in the prevention of postmenopausal osteoporosis was assessed in two randomized, double-blind, placebo-controlled trials. In one study of postmenopausal women aged 37 to 82 years without osteoporosis, the use of estrogen replacement therapy in both placebo- and ACTONEL-treated patients was included. The duration of the trial was one year, with 259 exposed to placebo and 261 patients exposed to ACTONEL 5 mg. The second study included postmenopausal women aged 44 to 63 years without osteoporosis. The duration of the trial was one year, with 125 exposed to placebo and 129 patients exposed to ACTONEL 5 mg. All women received 1000 mg of elemental calcium per day.

In the trial with estrogen replacement therapy, the incidence of all-cause mortality was 1.5% for the placebo group and 0.4% for the ACTONEL 5 mg group. The incidence of serious adverse events was 8.9% in the placebo group and 5.4% in the ACTONEL 5 mg group. The percentage of patients who withdrew from treatment due to adverse events was 18.9% in the placebo group and 10.3% in the ACTONEL 5 mg group. Constipation was reported by 1.9% of the placebo group and 6.5% of ACTONEL 5 mg group.

In the second trial, the incidence of all-cause mortality was 0.0% for both groups. The incidence of serious adverse events was 17.6% in the placebo group and 9.3% in the ACTONEL 5 mg group. The percentage of patients who withdrew from treatment due to adverse events was 6.4% in the placebo group and 5.4% in the ACTONEL 5 mg group. Nausea was reported by 6.4% of patients in the placebo group and 13.2% of patients in the ACTONEL 5 mg group.

Once-a-Week Dosing

There were no deaths in a 1-year, double-blind, placebo-controlled study of ACTONEL 35 mg once-aweek for prevention of bone loss in 278 postmenopausal women without osteoporosis. More treated subjects on ACTONEL reported arthralgia (placebo 7.8%; ACTONEL 13.9%), myalgia (placebo 2.1%; ACTONEL 5.1%), and nausea (placebo 4.3%; ACTONEL 7.3%) than subjects on placebo.

Treatment To Increase Bone Mass In Men With Osteoporosis

In a 2-year, double-blind, multicenter study, 284 men with osteoporosis were treated with placebo (N = 93) or ACTONEL 35 mg once-a-week (N = 191). The overall safety and tolerability profile of ACTONEL in men with osteoporosis was similar to the adverse events reported in the ACTONEL postmenopausal osteoporosis clinical trials, with the addition of benign prostatic hyperplasia(placebo 3%; ACTONEL 35 mg 5%), nephrolithiasis (placebo 0%; ACTONEL 35 mg 3%), and arrhythmia(placebo 0%; ACTONEL 35 mg 2%).

Treatment And Prevention Of Glucocorticoid-Induced Osteoporosis

The safety of ACTONEL 5 mg daily in the treatment and prevention of glucocorticoid-induced osteoporosis was assessed in two randomized, double-blind, placebo-controlled multinational trials of 344 patients [male (123) and female (221)] aged 18 to 85 years who had recently initiated oral glucocorticoid therapy (less than or equal to 3 months, prevention study) or were on long-term oral glucocorticoid therapy (greater than or equal to 6 months, treatment study). The duration of the trials was one year, with 170 patients exposed to placebo and 174 patients exposed to ACTONEL 5 mg daily. Patients in one study received 1000 mg elemental calcium plus 400 international units of vitamin D supplementation per day; patients in the other study received 500 mg calcium supplementation per day.

The incidence of all-cause mortality was 2.9% in the placebo group and 1.1% in the ACTONEL 5 mg daily group. The incidence of serious adverse events was 33.5% in the placebo group and 30.5% in the ACTONEL 5 mg daily group. The percentage of patients who withdrew from the study due to adverse events was 8.8% in the placebo group and 7.5% in the ACTONEL 5 mg daily group. Back pain was reported in 8.8% of patients in the placebo group and 17.8% of patients in the ACTONEL 5 mg daily group. Arthralgia was reported in 14.7% of patients in the placebo group and 24.7% of patients in the ACTONEL 5 mg daily group.

Treatment Of Paget’s Disease

ACTONEL has been studied in 392 patients with Paget’s disease of bone. As in trials of ACTONEL for other indications, the adverse experiences reported in the Paget’s disease trials have generally been mild or moderate, have not required discontinuation of treatment, and have not appeared to be related to patient age, gender, or race.

The safety of ACTONEL was assessed in a randomized, double-blind, active-controlled study of 122 patients aged 34 to 85 years. The duration of the trial was 540 days, with 61 patients exposed to ACTONEL and 61 patients exposed to Didronel®. The adverse event profile was similar for ACTONEL and Didronel: 6.6% (4/61) of patients treated with ACTONEL 30 mg daily for 2 months discontinued treatment due to adverse events, compared to 8.2% (5/61) of patients treated with Didronel 400 mg daily for 6 months. Table 2 lists adverse events reported in greater than or equal to 5% of ACTONEL-treated patients in Phase 3 Paget's disease trials. Adverse events shown are considered to be possibly or probably causally related in at least one patient.

Table 2 Adverse Events Reported in greater than or equal to 5% of ACTONEL-Treated Patients * in Phase 3 Paget's Disease Trials

Gastrointestinal Adverse Events:

During the first year of the study (treatment and nontreatment follow-up), the proportion of patients who reported upper gastrointestinal adverse events was similar between the treatment groups; no patients reported severe upper gastrointestinal adverse events. The incidence of diarrhea was 19.7% in the ACTONEL group and 14.8% in the Didronel group; none were serious or resulted in withdrawal.

Ocular Adverse Events:

Three patients who received ACTONEL 30 mg daily experienced acute iritis in 1 supportive study. All 3 patients recovered from their events; however, in 1 of these patients, the event recurred during ACTONEL treatment and again during treatment with pamidronate. All patients were effectively treated with topical steroids.

Postmarketing Experience

Because these adverse reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Hypersensitivity Reactions

Hypersensitivity and skin reactions have been reported, including angioedema, generalized rash, bullous skin reactions, Stevens-Johnson syndrome and toxic epidermal necrolysis.

Gastrointestinal Adverse Events

Events involving upper gastrointestinal irritation, such as esophagitis and esophageal or gastriculcers, have been reported [see WARNINGS AND PRECAUTIONS].

Musculoskeletal Pain

Bone, joint, or muscle pain, described as severe or incapacitating, have been reported rarely [see WARNINGS AND PRECAUTIONS].

Eye Inflammation

Reactions of eye inflammation including iritis and uveitis have been reported rarely.

Jaw Osteonecrosis

Osteonecrosis of the jaw has been reported rarely [see WARNINGS AND PRECAUTIONS].

Pulmonary

Asthma exacerbations

Drug Interactions

DRUG INTERACTIONS

No specific drug-drug interaction studies were performed. Risedronate is not metabolized and does not induce or inhibit hepatic microsomal drug-metabolizing enzymes (for example, Cytochrome P450).

Calcium Supplements /Antacids

Co-administration of ACTONEL and calcium, antacids, or oral medications containing divalent cations will interfere with the absorption of ACTONEL.

Hormone Replacement Therapy

One study of about 500 early postmenopausal women has been conducted to date in which treatment with ACTONEL 5 mg daily plus estrogen replacement therapy was compared to estrogen replacement therapy alone. Exposure to study drugs was approximately 12 to 18 months and the primary endpoint was change in BMD. If considered appropriate, ACTONEL may be used concomitantly with hormone replacement therapy.

Aspirin/Nonsteroidal Anti-Inflammatory Drugs

Of over 5700 patients enrolled in the ACTONEL Phase 3 osteoporosis studies, aspirin use was reported by 31% of patients, 24% of whom were regular users (3 or more days per week). Forty-eight percent of patients reported NSAID use, 21% of whom were regular users. Among regular aspirin or NSAID users, the incidence of upper gastrointestinal adverse experiences in placebo-treated patients (24.8%) was similar to that in ACTONEL-treated patients (24.5%).

H Blockers And Proton Pump Inhibitors (PPIs )

Of over 5700 patients enrolled in the ACTONEL Phase 3 osteoporosis studies, 21% used H blockers and/or PPIs. Among these patients, the incidence of upper gastrointestinal adverse experiences in the placebo-treated patients was similar to that in ACTONEL-treated patients.

Warnings & Precautions

WARNINGS

Included as part of the "PRECAUTIONS" Section

PRECAUTIONS

Drug Products With The Same Active Ingredient

ACTONEL contains the same active ingredient found in Atelvia®. A patient being treated with Atelvia should not receive ACTONEL.

Upper Gastrointestinal Adverse Reactions

ACTONEL, like other bisphosphonates administered orally, may cause local irritation of the upper gastrointestinal mucosa. Because of these possible irritant effects and a potential for worsening of the underlying disease, caution should be used when ACTONEL is given to patients with active upper gastrointestinal problems (such as known Barrett’s esophagus, dysphagia, other esophagealdiseases, gastritis, duodenitis or ulcers) [see CONTRAINDICATIONS, ADVERSE REACTIONS, PATIENT INFORMATION].

Esophageal adverse experiences, such as esophagitis, esophageal ulcers and esophageal erosions, occasionally with bleeding and rarely followed by esophageal stricture or perforation, have been reported in patients receiving treatment with oral bisphosphonates. In some cases, these have been severe and required hospitalization. Physicians should therefore be alert to any signs or symptoms signaling a possible esophageal reaction and patients should be instructed to discontinue ACTONEL and seek medical attention if they develop dysphagia, odynophagia, retrosternal pain or new or worsening heartburn.

The risk of severe esophageal adverse experiences appears to be greater in patients who lie down after taking oral bisphosphonates and/or who fail to swallow it with the recommended full glass (6 to 8 ounces) of water, and/or who continue to take oral bisphosphonates after developing symptoms suggestive of esophageal irritation. Therefore, it is very important that the full dosing instructions are provided to, and understood by, the patient [see DOSAGE AND ADMINISTRATION]. In patients who cannot comply with dosing instructions due to mental disability, therapy with ACTONEL should be used under appropriate supervision.

There have been post-marketing reports of gastric and duodenal ulcers with oral bisphosphonate use, some severe and with complications, although no increased risk was observed in controlled clinical trials.

Mineral Metabolism

Hypocalcemia has been reported in patients taking ACTONEL. Treat hypocalcemia and other disturbances of bone and mineral metabolism before starting ACTONEL therapy. Instruct patients to take supplemental calcium and vitamin D if their dietary intake is inadequate. Adequate intake of calcium and vitamin D is important in all patients, especially in patients with Paget’s disease in whom bone turnover is significantly elevated [see CONTRAINDICATIONS, ADVERSE REACTIONS, PATIENT INFORMATION].

Jaw Osteonecrosis

Osteonecrosis of the jaw (ONJ), which can occur spontaneously, is generally associated with tooth extraction and/or local infection with delayed healing, and has been reported in patients taking bisphosphonates, including ACTONEL. Known risk factors for osteonecrosis of the jaw include invasive dental procedures (for example, tooth extraction, dental implants, boney surgery), diagnosis of cancer, concomitant therapies (for example, chemotherapy, corticosteroids, angiogenesisinhibitors), poor oral hygiene, and co-morbid disorders (for example, periodontal and/or other pre-existing dental disease, anemia, coagulopathy, infection, ill-fitting dentures). The risk of ONJ may increase with duration of exposure to bisphosphonates.

For patients requiring invasive dental procedures, discontinuation of bisphosphonate treatment may reduce the risk for ONJ. Clinical judgment of the treating physician and/or oral surgeon should guide the management plan of each patient based on individual benefit/risk assessment.

Patients who develop osteonecrosis of the jaw while on bisphosphonate therapy should receive care by an oral surgeon. In these patients, extensive dental surgery to treat ONJ may exacerbate the condition. Discontinuation of bisphosphonate therapy should be considered based on individual benefit/risk assessment [see ADVERSE REACTIONS].

Musculoskeletal Pain

In postmarketing experience, there have been reports of severe and occasionally incapacitating bone, joint, and/or muscle pain in patients taking bisphosphonates [see ADVERSE REACTIONS]. The time to onset of symptoms varied from one day to several months after starting the drug. Most patients had relief of symptoms after stopping medication. A subset had recurrence of symptoms when rechallenged with the same drug or another bisphosphonate. Consider discontinuing use if severe symptoms develop.

Atypical Subtrochanteric And Diaphyseal Femoral Fractures

Atypical, low-energy, or low trauma fractures of the femoral shaft have been reported in bisphosphonate-treated patients. These fractures can occur anywhere in the femoral shaft from just below the lesser trochanter to above the supracondylar flare and are traverse or short oblique in orientation without evidence of comminution. Causality has not been established as these fractures also occur in osteoporotic patients who have not been treated with bisphosphonates.

Atypical femur fractures most commonly occur with minimal or no trauma to the affected area. They may be bilateral and many patients report prodromal pain in the affected area, usually presenting as dull, aching thigh pain, weeks to months before a complete fracture occurs. A number of reports note that patients were also receiving treatment with glucocorticoids (for example, prednisone) at the time of fracture.

Any patient with a history of bisphosphonate exposure who presents with thigh or groin pain should be suspected of having an atypical fracture and should be evaluated to rule out an incomplete femur fracture. Patients presenting with an atypical fracture should also be assessed for symptoms and signs of fracture in the contralateral limb. Interruption of bisphosphonate therapy should be considered, pending a risk/benefit assessment, on an individual basis.

Renal Impairment

ACTONEL is not recommended for use in patients with severe renal impairment (creatinine clearance less than 30 mL/min).

Glucocorticoid-Induced Osteoporosis

Before initiating ACTONEL treatment for the treatment and prevention of glucocorticoid-inducedosteoporosis, the sex steroid hormonal status of both men and women should be ascertained and appropriate replacement considered.

Laboratory Test Interactions

Bisphosphonates are known to interfere with the use of bone-imaging agents. Specific studies with ACTONEL have not been performed.

Patient Counseling Information

See FDA-approved patient labeling (PATIENT INFORMATION)

Instruct patients to read the Medication Guide before starting therapy with ACTONEL and to re-read it each time the prescription is renewed.

Instruct patients that Atelvia and ACTONEL contain the same active ingredient and if they are taking Atelvia, they should not take ACTONEL [see WARNINGS AND PRECAUTIONS].

Instruct patients to pay particular attention to the dosing instructions as clinical benefits may be compromised by failure to take the drug according to instructions. Specifically, ACTONEL should be taken at least 30 minutes before the first food or drink of the day other than water.

Instruct patients to take ACTONEL while in an upright position (sitting or standing) with a full glass of plain water (6 to 8 ounces) to facilitate delivery to the stomach, and thus reduce the potential for esophageal irritation.

Instruct patients not to lie down for 30 minutes after taking the medication [see WARNINGS AND PRECAUTIONS].

Instruct patients not to chew or suck on the tablet because of a potential for oropharyngeal irritation.

Instruct patients that if they develop symptoms of esophageal disease (such as difficulty or pain upon swallowing, retrosternal pain or severe persistent or worsening heartburn) they should consult their physician before continuing ACTONEL.

Instruct patients about missing ACTONEL doses as follows:

· If a dose of ACTONEL 35 mg once-a-week is missed, they should take 1 tablet on the morning after they remember and return to taking 1 tablet once-a-week, as originally scheduled on their chosen day. Patients should not take 2 tablets on the same day.

· If one or both tablets of ACTONEL 75 mg on two consecutive days per month are missed, and the next month’s scheduled doses are more than 7 days away, the patient should be instructed as follows:

o If both tablets are missed, take one ACTONEL 75 mg tablet in the morning after the day it is remembered and then the other tablet on the next consecutive morning.

o If only one ACTONEL 75 mg tablet is missed, take the missed tablet in the morning after the day it is remembered.

o Patients should then return to taking their ACTONEL 75 mg on two consecutive days per month as originally scheduled. Patients should not take more than two 75 mg tablets within 7 days.

· If one or both tablets of ACTONEL 75 mg on two consecutive days per month are missed, and the next month's scheduled doses are within 7 days, patients should wait until their next month’s scheduled doses and then continue taking ACTONEL 75 mg on two consecutive days per month as originally scheduled.

· If the dose of ACTONEL 150 mg once-a-month is missed, and the next month’s scheduled dose is more than 7 days away, the patient should be instructed to take the missed tablet in the morning after the day it is remembered. Patients should then return to taking their ACTONEL 150 mg once-amonth as originally scheduled. Patients should not take more than one 150 mg tablet within 7 days.

· If the dose of ACTONEL 150 mg once-a-month is missed, and the next month's scheduled dose is within 7 days, patients should wait until their next month’s scheduled dose and then continue taking ACTONEL 150 mg once-a-month as originally scheduled.

Instruct patients to take supplemental calcium and vitamin D if dietary intake is inadequate [see WARNINGS AND PRECAUTIONS]. Weight-bearing exercise should be considered along with the modification of certain behavioral factors, such as excessive cigarette smoking, and/or alcohol consumption, if these factors exist.

Instruct patients to take calcium supplements or calcium-, aluminum-, and magnesium-containing medications at a different time of the day than ACTONEL as these medications may interfere with the absorption of ACTONEL.

Remind patients to give all of their healthcare providers an accurate medication history. Instruct patients to tell all of their healthcare providers that they are taking ACTONEL. Patients should be instructed that any time they have a medical problem they think may be from ACTONEL, they should talk to their doctor.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Carcinogenesis

In a 104-week carcinogenicity study, rats were administered daily oral doses up to approximately 8 times the maximum recommended human daily dose. There were no significant drug-induced tumor findings in male or female rats. The high dose male group was terminated early in the study (Week 93) due to excessive toxicity, and data from this group were not included in the statistical evaluation of the study results. In an 80-week carcinogenicity study, mice were administered daily oral doses approximately 6.5 times the human dose. There were no significant drug-induced tumor findings in male or female mice.

Mutagenesis

Risedronate did not exhibit genetic toxicity in the following assays: In vitro bacterial mutagenesis inSalmonella and E. coli (Ames assay), mammalian cell mutagenesis in CHO/HGPRT assay, unscheduled DNA synthesis in rat hepatocytes and an assessment of chromosomal aberrations in vivo in rat bone marrow. Risedronate was positive in a chromosomal aberration assay in CHO cells at highly cytotoxic concentrations (greater than 675 mcg/mL, survival of 6% to 7%). When the assay was repeated at doses exhibiting appropriate cell survival (29%), there was no evidence of chromosomal damage.

Impairment Of Fertility

In female rats, ovulation was inhibited at an oral dose approximately 5 times the human dose. Decreased implantation was noted in female rats treated with doses approximately 2.5 times the human dose. In male rats, testicular and epididymal atrophy and inflammation were noted at approximately 13 times the human dose. Testicular atrophy was also noted in male rats after 13 weeks of treatment at oral doses approximately 5 times the human dose. There was moderate-to-severe spermatid maturation block after 13 weeks in male dogs at an oral dose approximately 8 times the human dose. These findings tended to increase in severity with increased dose and exposure time.

Dosing multiples provided above are based on the recommended human dose of 30 mg/day and normalized using body surface area (mg/m2 ). Actual doses were 24 mg/kg/day in rats, 32 mg/kg/day in mice, and 8, 16 and 40 mg/kg/day in dogs.

Use In Specific Populations

Pregnancy

Pregnancy Category C

There are no adequate and well-controlled studies of ACTONEL in pregnant women. ACTONEL should be used during pregnancy only if the potential benefit justifies the potential risk to the mother and fetus.

Bisphosphonates are incorporated into the bone matrix, from which they are gradually released over periods of weeks to years. The amount of bisphosphonate incorporation into adult bone, and hence, the amount available for release back into the systemic circulation, is directly related to the dose and duration of bisphosphonate use. There are no data on fetal risk in humans. However, there is a theoretical risk of fetal harm, predominantly skeletal, if a woman becomes pregnant after completing a course of bisphosphonate therapy. The impact of variables such as time between cessation of bisphosphonate therapy to conception, the particular bisphosphonate used, and the route of administration (intravenous versus oral) on this risk has not been studied.

In animal studies, pregnant rats received risedronate sodium during organogenesis at doses 1 to 26 times the human dose of 30 mg/day. Survival of neonates was decreased in rats treated during gestation with oral doses approximately 5 times the human dose and body weight was decreased in neonates from dams treated with approximately 26 times the human dose. The number of fetuses exhibiting incomplete ossification of sternebrae or skull from dams treated with approximately 2.5 times the human dose was significantly increased compared to controls. Both incomplete ossification and unossified sternebrae were increased in rats treated with oral doses approximately 5 times the human dose. A low incidence of cleft palate was observed in fetuses from female rats treated with oral doses approximately equal to the human dose. The relevance of this finding to human use of ACTONEL is unclear.

No significant fetal ossification effects were seen in rabbits treated with oral doses approximately 7 times the human dose (the highest dose tested). However, 1 of 14 litters were aborted and 1 of 14 litters were delivered prematurely.

Similar to other bisphosphonates, treatment during mating and gestation with doses of risedronate sodium approximately the same as the 30 mg/day human dose resulted in periparturient hypocalcemia and mortality in pregnant rats allowed to deliver.

Dosing multiples provided above are based on the recommended human dose of 30 mg/day and normalized using body surface area (mg/m2). Actual animal doses were 3.2, 7.1 and 16 mg/kg/day in the rat and 10 mg/kg/day in the rabbit.

Nursing Mothers

Risedronate was detected in feeding pups exposed to lactating rats for a 24-hour period post-dosing, indicating a small degree of lacteal transfer. It is not known whether ACTONEL is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from ACTONEL, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

Pediatric Use

ACTONEL is not indicated for use in pediatric patients.

The safety and effectiveness of risedronate was assessed in a one-year, randomized, double-blind, placebo controlled study of 143 pediatric patients (94 received risedronate) with osteogenesisimperfecta (OI). The enrolled population was predominantly patients with mild osteogenesis imperfecta (85% Type-I), aged 4 to less than 16 years, 50% male and 82% Caucasian, with a mean lumbar spine BMD Z-score of -2.08 (2.08 standard deviations below the mean for age-matched controls). Patients received either a 2.5 mg (less than or equal to 30 kg body weight) or 5 mg (greater than 30 kg body weight) daily oral dose. After one year, an increase in lumbar spine BMD in the risedronate group compared to the placebo group was observed. However, treatment with risedronate did not result in a reduction in the risk of fracture in pediatric patients with osteogenesis imperfecta. In ACTONELtreated subjects, no mineralization defects were noted in paired bone biopsy specimens obtained at baseline and month 12.

The overall safety profile of risedronate in OI patients treated for up to 12 months was generally similar to that of adults with osteoporosis. However, there was an increased incidence of vomitingcompared to placebo. In this study, vomiting was observed in 15% of children treated with risedronate and 6% of patients treated with placebo. Other adverse events reported in greater than or equal to 10% of patients treated with risedronate and with a higher frequency than placebo were: pain in the extremity (21% with risedronate versus 16% with placebo), headache (20% versus 8%), back pain (17% versus 10%), pain (15% versus 10%), upper abdominal pain (11% versus 8%), and bone pain (10% versus 4%).

Geriatric Use

Of the patients receiving ACTONEL in postmenopausal osteoporosis studies [see Clinical Studies], 47% were between 65 and 75 years of age, and 17% were over 75. The corresponding proportions were 26% and 11% in glucocorticoid-induced osteoporosis trials, and 40% and 26% in Paget’s disease trials. No overall differences in efficacy between geriatric and younger patients were observed in these studies. In the male osteoporosis trial, 28% of patients receiving ACTONEL were between 65 and 75 years of age and 9% were over 75. The lumbar spine BMD response for ACTONEL compared to placebo was 5.6% for subjects less than 65 years and 2.9% for subjects greater than or equal to 65 years. No overall differences in safety between geriatric and younger patients were observed in the ACTONEL trials, but greater sensitivity of some older individuals cannot be ruled out.

Renal Impairment

ACTONEL is not recommended for use in patients with severe renal impairment (creatinine clearance less than 30 mL/min) because of lack of clinical experience. No dosage adjustment is necessary in patients with a creatinine clearance greater than or equal to 30 mL/min.

Hepatic Impairment

No studies have been performed to assess risedronate’s safety or efficacy in patients with hepatic impairment. Risedronate is not metabolized in human liver preparations. Dosage adjustment is unlikely to be needed in patients with hepatic impairment.

Overdosage

OVERDOSE

Decreases in serum calcium and phosphorus following substantial overdose may be expected in some patients. Signs and symptoms of hypocalcemia may also occur in some of these patients. Milk or antacids containing calcium should be given to bind ACTONEL and reduce absorption of the drug.

In cases of substantial overdose, gastric lavage may be considered to remove unabsorbed drug. Standard procedures that are effective for treating hypocalcemia, including the administration of calcium intravenously, would be expected to restore physiologic amounts of ionized calcium and to relieve signs and symptoms of hypocalcemia.

Lethality after single oral doses was seen in female rats at 903 mg/kg and male rats at 1703 mg/kg. The minimum lethal dose in mice and rabbits was 4000 mg/kg and 1000 mg/kg, respectively. These values represent 320 to 620 times the 30 mg human dose based on surface area (mg/m2 ).

Contraindications

CONTRAINDICATIONS

ACTONEL is contraindicated in patients with the following conditions:

· Abnormalities of the esophagus which delay esophageal emptying such as stricture or achalasia [see WARNINGS AND PRECAUTIONS]

· Inability to stand or sit upright for at least 30 minutes [see DOSAGE AND ADMINISTRATION, WARNINGS AND PRECAUTIONS]

· Hypocalcemia [see WARNINGS AND PRECAUTIONS]

· Known hypersensitivity to ACTONEL or any of its excipients. Angioedema, generalized rash, bullous skin reactions, Stevens-Johnson syndrome and toxic epidermal necrolysis have been reported [see ADVERSE REACTIONS]

Clinical Pharmacology

CLINICAL PHARMACOLOGY

Mechanism Of Action

ACTONEL has an affinity for hydroxyapatite crystals in bone and acts as an antiresorptive agent. At the cellular level, ACTONEL inhibits osteoclasts. The osteoclasts adhere normally to the bone surface, but show evidence of reduced active resorption (for example, lack of ruffled border). Histomorphometry in rats, dogs, and minipigs showed that ACTONEL treatment reduces bone turnover (activation frequency, that is, the rate at which bone remodeling sites are activated) and bone resorption at remodeling sites.

Pharmacodynamics

ACTONEL treatment decreases the elevated rate of bone turnover that is typically seen in postmenopausal osteoporosis. In clinical trials, administration of ACTONEL to postmenopausal women resulted in decreases in biochemical markers of bone turnover, including urinary deoxypyridinoline/creatinine and urinary collagen cross-linked N-telopeptide (markers of bone resorption) and serum bone-specific alkaline phosphatase (a marker of bone formation). At the 5 mg dose, decreases in deoxypyridinoline/creatinine were evident within 14 days of treatment. Changes in bone formation markers were observed later than changes in resorption markers, as expected, due to the coupled nature of bone resorption and bone formation; decreases in bone-specific alkaline phosphatase of about 20% were evident within 3 months of treatment. Bone turnover markers reached a nadir of about 40% below baseline values by the sixth month of treatment and remained stable with continued treatment for up to 3 years. Bone turnover is decreased as early as 14 days and maximally within about 6 months of treatment, with achievement of a new steady-state that more nearly approximates the rate of bone turnover seen in premenopausal women. In a 1-year study comparing daily versus weekly oral dosing regimens of ACTONEL for the treatment of osteoporosis in postmenopausal women, ACTONEL 5 mg daily and ACTONEL 35 mg once-a-week decreased urinary collagen cross-linked Ntelopeptide by 60% and 61%, respectively. In addition, serum bone-specific alkaline phosphatase was also reduced by 42% and 41% in the ACTONEL 5 mg daily and ACTONEL 35 mg once-a-week groups, respectively. When postmenopausal women with osteoporosis were treated for 1 year with ACTONEL 5 mg daily or ACTONEL 75 mg two consecutive days per month, urinary collagen crosslinked N-telopeptide was decreased by 54% and 52%, respectively, and serum bone-specific alkaline phosphatase was reduced by 36% and 35%, respectively. In a 1–year study comparing ACTONEL 5 mg daily versus ACTONEL 150 mg once-a-month in women with postmenopausal osteoporosis, urinary collagen cross-linked N-telopeptide was decreased by 52% and 49%, respectively, and serum bonespecific alkaline phosphatase was reduced by 31% and 32%, respectively.

Osteoporosis In Men

In a 2-year study of men with osteoporosis, treatment with ACTONEL 35 mg once-a-week resulted in a mean decrease from baseline compared to placebo of 16% (placebo 20%; ACTONEL 35 mg 37%) for the bone resorption marker urinary collagen cross-linked N-telopeptide, 45% (placebo -6%; ACTONEL 35 mg 39%) for the bone resorption marker serum C-telopeptide, and 27% (placebo -2%; ACTONEL 35 mg 25%) for the bone formation marker serum bone-specific alkaline phosphatase.

Glucocorticoid-Induced Osteoporosis

Osteoporosis with glucocorticoid use occurs as a result of inhibited bone formation and increased bone resorption resulting in net bone loss. ACTONEL decreases bone resorption without directly inhibiting bone formation.

In two 1-year clinical trials in the treatment and prevention of glucocorticoid-induced osteoporosis, ACTONEL 5 mg decreased urinary collagen cross-linked N-telopeptide (a marker of bone resorption), and serum bone-specific alkaline phosphatase (a marker of bone formation) by 50% to 55% and 25% to 30%, respectively, within 3 to 6 months after initiation of therapy.

Paget’s Disease

Paget’s disease of bone is a chronic, focal skeletal disorder characterized by greatly increased and disordered bone remodeling. Excessive osteoclastic bone resorption is followed by osteoblastic new bone formation, leading to the replacement of the normal bone architecture by disorganized, enlarged, and weakened bone structure.

In pagetic patients treated with ACTONEL 30 mg daily for 2 months, bone turnover returned to normal in a majority of patients as evidenced by significant reductions in serum alkaline phosphatase (a marker of bone formation), and in urinary hydroxyproline/creatinine and deoxypyridinoline/creatinine (markers of bone resorption).

Pharmacokinetics

Absorption

Based on simultaneous modeling of serum and urine data, peak absorption after an oral dose is achieved at approximately 1 hour (T ) and occurs throughout the upper gastrointestinal tract. The fraction of the dose absorbed is independent of dose over the range studied (single dose, from 2.5 mg to 30 mg; multiple dose, from 2.5 mg to 5 mg). Steady-state conditions in the serum are observed within 57 days of daily dosing. Mean absolute oral bioavailability of the 30 mg tablet is 0.63% (90% CI: 0.54% to 0.75%) and is comparable to a solution.

Food Effect

The extent of absorption of a 30 mg dose (three 10 mg tablets) when administered 0.5 hours before breakfast is reduced by 55% compared to dosing in the fasting state (no food or drink for 10 hours prior to or 4 hours after dosing). Dosing 1 hour prior to breakfast reduces the extent of absorption by 30% compared to dosing in the fasting state. Dosing either 0.5 hours prior to breakfast or 2 hours after dinner (evening meal) results in a similar extent of absorption. ACTONEL is effective when administered at least 30 minutes before breakfast.

Distribution

The mean steady-state volume of distribution for risedronate is 13.8 L/kg in humans. Human plasma protein binding of drug is about 24%. Preclinical studies in rats and dogs dosed intravenously with single doses of [14C] risedronate indicate that approximately 60% of the dose is distributed to bone. The remainder of the dose is excreted in the urine. After multiple oral dosing in rats, the uptake of risedronate in soft tissues was in the range of 0.001% to 0.01%.

Metabolism

There is no evidence of systemic metabolism of risedronate.

Excretion

In young healthy subjects, approximately half of the absorbed dose of risedronate was excreted in urine within 24 hours, and 85% of an intravenous dose was recovered in the urine over 28 days. Based on simultaneous modeling of serum and urine data, mean renal clearance was 105 mL/min (CV = 34%) and mean total clearance was 122 mL/min (CV = 19%), with the difference primarily reflecting nonrenal clearance or clearance due to adsorption to bone. The renal clearance is not concentration dependent, and there is a linear relationship between renal clearance and creatinine clearance. Unabsorbed drug is eliminated unchanged in feces. In osteopenic postmenopausal women, the terminal exponential half-life was 561 hours, mean renal clearance was 52 mL/min (CV = 25%), and mean total clearance was 73 mL/min (CV = 15%).

Specific Populations

Pediatric

ACTONEL is not indicated for use in pediatric patients [see Pediatric Use].

Gender

Bioavailability and pharmacokinetics following oral administration are similar in men and women.

Geriatric

Bioavailability and disposition are similar in elderly (greater than 60 years of age) and younger subjects. No dosage adjustment is necessary.

Race

Pharmacokinetic differences due to race have not been studied.

Renal Impairment

Risedronate is excreted unchanged primarily via the kidney. As compared to persons with normal renal function, the renal clearance of risedronate was decreased by about 70% in patients with creatinine clearance of approximately 30 mL/min. ACTONEL is not recommended for use in patients with severe renal impairment (creatinine clearance less than 30 mL/min) because of lack of clinical experience. No dosage adjustment is necessary in patients with a creatinine clearance greater than or equal to 30 mL/min.

Hepatic Impairment

No studies have been performed to assess risedronate’s safety or efficacy in patients with hepatic impairment. Risedronate is not metabolized in rat, dog, and human liver preparations. Insignificant amounts (less than 0.1% of intravenous dose) of drug are excreted in the bile in rats. Therefore, dosage adjustment is unlikely to be needed in patients with hepatic impairment.

Drug Interactions

No specific drug-drug interaction studies were performed. Risedronate is not metabolized and does not induce or inhibit hepatic microsomal drug-metabolizing enzymes (Cytochrome P450) [see DRUG INTERACTIONS].

Animal Toxicology And/Or Pharmacology

Risedronate demonstrated potent anti-osteoclast, antiresorptive activity in ovariectomized rats and minipigs. Bone mass and biomechanical strength were increased dose-dependently at daily oral doses up to 4 and 25 times the human recommended oral dose of 5 mg for rats and minipigs, respectively. Risedronate treatment maintained the positive correlation between BMD and bone strength and did not have a negative effect on bone structure or mineralization. In intact dogs, risedronate induced positive bone balance at the level of the bone remodeling unit at oral doses ranging from 0.5 to 1.5 times the 5 mg/day human daily dose.

In dogs treated with an oral dose approximately 5 times the human daily dose, risedronate caused a delay in fracture healing of the radius. The observed delay in fracture healing is similar to other bisphosphonates. This effect did not occur at a dose approximately 0.5 times the human daily dose.

The Schenk rat assay, based on histologic examination of the epiphyses of growing rats after drug treatment, demonstrated that risedronate did not interfere with bone mineralization even at the highest dose tested, which was approximately 3500 times the lowest antiresorptive dose in this model (1.5 mcg/kg/day) and approximately 800 times the human daily dose of 5 mg. This indicates that ACTONEL administered at the therapeutic dose is unlikely to induce osteomalacia.

Dosing multiples provided above are based on the recommended human dose of 5 mg/day and normalized using body surface area (mg/m2 ).

Clinical Studies

Treatment Of Osteoporosis In Postmenopausal Women

The fracture efficacy of ACTONEL 5 mg daily in the treatment of postmenopausal osteoporosis was demonstrated in 2 large, randomized, placebo-controlled, double-blind studies that enrolled a total of almost 4000 postmenopausal women under similar protocols. The Multinational study (VERT MN) (ACTONEL 5 mg, N = 408) was conducted primarily in Europe and Australia; a second study was conducted in North America (VERT NA) (ACTONEL 5 mg, N = 821). Patients were selected on the basis of radiographic evidence of previous vertebral fracture, and therefore, had established disease. The average number of prevalent vertebral fractures per patient at study entry was 4 in VERT MN, and 2.5 in VERT NA, with a broad range of baseline BMD levels. All patients in these studies received supplemental calcium 1000 mg/day. Patients with low 25-hydroxyvitamin D3 levels (approximately 40 nmol/L or less) also received supplemental vitamin D 500 international units/day.

Effect On Vertebral Fractures

Fractures of previously undeformed vertebrae (new fractures) and worsening of pre-existing vertebral fractures were diagnosed radiographically; some of these fractures were also associated with symptoms (that is, clinical fractures). Spinal radiographs were scheduled annually and prospectively planned analyses were based on the time to a patient’s first diagnosed fracture. The primary endpoint for these studies was the incidence of new and worsening vertebral fractures across the period of 0 to 3 years. ACTONEL 5 mg daily significantly reduced the incidence of new and worsening vertebral fractures and of new vertebral fractures in both VERT NA and VERT MN at all time points (Table 3). The reduction in risk seen in the subgroup of patients who had 2 or more vertebral fractures at study entry was similar to that seen in the overall study population.

Table 3: The Effect of ACTONEL on the Risk of Vertebral Fractures

Effect On Osteoporosis-Related Nonvertebral Fractures

In VERT MN and VERT NA, a prospectively planned efficacy endpoint was defined consisting of all radiographically confirmed fractures of skeletal sites accepted as associated with osteoporosis. Fractures at these sites were collectively referred to as osteoporosis-related nonvertebral fractures. ACTONEL 5 mg daily significantly reduced the incidence of nonvertebral osteoporosis-related fractures over 3 years in VERT NA (8% versus 5%; relative risk reduction 39%) and reduced the fracture incidence in VERT MN from 16% to 11%. There was a significant reduction from 11% to 7% when the studies were combined, with a corresponding 36% reduction in relative risk. Figure 1 shows the overall results as well as the results at the individual skeletal sites for the combined studies.

Figure 1: Nonvertebal Osteoporosis -Related Fractures Cumulative Incidence Over 3 Years 
Combined VERT MN and VERT NA

Effect On Bone Mineral Density

The results of 4 randomized, placebo-controlled trials in women with postmenopausal osteoporosis (VERT MN, VERT NA, BMD MN, BMD NA) demonstrate that ACTONEL 5 mg daily increases BMD at the spine, hip, and wrist compared to the effects seen with placebo. Table 4 displays the significant increases in BMD seen at the lumbar spine, femoral neck, femoral trochanter, and midshaft radius in these trials compared to placebo. In both VERT studies (VERT MN and VERT NA), ACTONEL 5 mg daily produced increases in lumbar spine BMD that were progressive over the 3 years of treatment, and were statistically significant relative to baseline and to placebo at 6 months and at all later time points.

Table 4: Mean Percent Increase in BMD from Baseline in Patients Taking ACTONEL 5 mg or Placebo at Endpointa

ACTONEL 35 mg once-a-week (N = 485) was shown to be non-inferior to ACTONEL 5 mg daily (N = 480) in a 1-year, double-blind, multicenter study of postmenopausal women with osteoporosis. In the primary efficacy analysis of completers, the mean increases from baseline in lumbar spine BMD at 1 year were 4.0% (3.7, 4.3; 95% confidence interval [CI]) in the 5 mg daily group (N = 391) and 3.9% (3.6, 4.3; 95% CI) in the 35 mg once-a-week group (N = 387) and the mean difference between 5 mg daily and 35 mg once-a-week was 0.1% (-0.4, 0.6; 95% CI). The results of the intent-to-treat analysis with the last observation carried forward were consistent with the primary efficacy analysis of completers. The 2 treatment groups were also similar with regard to BMD increases at other skeletal sites.

In a double-blind, multicenter study of postmenopausal women with osteoporosis, treatment with ACTONEL 75 mg two consecutive days per month (N = 616) was shown to be non-inferior to ACTONEL 5 mg daily (N = 613). In the primary efficacy analysis of completers, the mean increases from baseline in lumbar spine BMD at 1 year were 3.6% (3.3, 3.9; 95% CI) in the 5 mg daily group (N = 527) and 3.4% (3.1, 3.7; 95% CI) in the 75 mg two days per month group (N = 524) with a mean difference between groups being 0.2% (-0.2, 0.6; 95% CI). The results of the intent-to-treat analysis with the last observation carried forward were consistent with the primary efficacy analysis of completers. The 2 treatment groups were also similar with regard to BMD increases at other skeletal sites.

ACTONEL 150 mg once-a-month (N = 650) was shown to be non-inferior to ACTONEL 5 mg daily (N = 642) in a 1-year, double-blind, multicenter study of postmenopausal women with osteoporosis. The primary efficacy analysis was conducted in all randomized patients with baseline and post-baseline lumbar spine BMD values (modified intent-to-treat population) using last observation carried forward. The mean increases from baseline in lumbar spine BMD at 1 year were 3.4% (3.0, 3.8; 95% CI) in the 5 mg daily group (N = 561), and 3.5% (3.1, 3.9; 95% CI) in the 150 mg once-a-month group (N = 578) with a mean difference between groups being -0.1% (-0.5, 0.3; 95% CI). The results of the completers analysis were consistent with the primary efficacy analysis. The 2 treatment groups were also similar with regard to BMD increases at other skeletal sites.

Histology/Histomorphometry

Bone biopsies from 110 postmenopausal women were obtained at endpoint. Patients had received placebo or daily ACTONEL (2.5 mg or 5 mg) for 2 to 3 years. Histologic evaluation (N = 103) showed no osteomalacia, impaired bone mineralization, or other adverse effects on bone in ACTONEL-treated women. These findings demonstrate that bone formed during ACTONEL administration is of normal quality. The histomorphometric parameter mineralizing surface, an index of bone turnover, was assessed based upon baseline and post-treatment biopsy samples from 21 treated with placebo and 23 patients treated with ACTONEL 5 mg. Mineralizing surface decreased moderately in ACTONELa treated patients (median percent change: placebo, -21%; ACTONEL 5 mg, -74%), consistent with the known effects of treatment on bone turnover.

Effect On Height

In the two 3-year osteoporosis treatment studies, standing height was measured yearly by stadiometer. Both ACTONEL and placebo-treated groups lost height during the studies. Patients who received ACTONEL had a statistically significantly smaller loss of height than those who received placebo. In VERT MN, the median annual height change was -2.4 mm/yr in the placebo group compared to -1.3 mm/yr in the ACTONEL 5 mg daily group. In VERT NA, the median annual height change was -1.1 mm/yr in the placebo group compared to -0.7 mm/yr in the ACTONEL 5 mg daily group.

Prevention Of Osteoporosis In Postmenopausal Women

The safety and effectiveness of ACTONEL 5 mg daily for the prevention of postmenopausal osteoporosis were demonstrated in a 2-year, double-blind, placebo-controlled study of 383 postmenopausal women (age range 42 to 63 years) within three years of menopause (ACTONEL 5 mg, N = 129). All patients in this study received supplemental calcium 1000 mg/day. Increases in BMD were observed as early as 3 months following initiation of ACTONEL treatment. ACTONEL 5 mg daily produced significant mean increases in BMD at the lumbar spine, femoral neck, and trochanter compared to placebo at the end of the study (Figure 2). ACTONEL 5 mg daily was also effective in patients with lower baseline lumbar spine BMD (more than 1 SD below the premenopausal mean) and in those with normal baseline lumbar spine BMD. Bone mineral density at the distal radius decreased in both ACTONEL and placebo-treated women following 1 year of treatment.

Figure 2: Change in BMD from Baseline 
2-Year Prevention Study

The safety and effectiveness of ACTONEL 35 mg once-a-week for the prevention postmenopausal osteoporosis were demonstrated in a 1-year, double-blind, placebo-controlled study of 278 patients (ACTONEL 35 mg, N = 136). All patients were supplemented with 1000 mg elemental calcium and 400 international units vitamin D per day. The primary efficacy measure was the percent change in lumbar spine BMD from baseline after 1 year of treatment using LOCF (last observation carried forward). ACTONEL 35 mg once-a-week resulted in a statistically significant mean difference from placebo in lumbar spine BMD of +2.9% (least square mean for placebo -1.05%; risedronate +1.83%). ACTONEL 35 mg once-a-week also showed a statistically significant mean difference from placebo in BMD at the total proximal femur of +1.5% (placebo -0.53%; risedronate +1.01%), femoral neck of +1.2% (placebo -1.00%; risedronate +0.22%), and trochanter of +1.8% (placebo -0.74%; risedronate +1.07%).

Combined Administration With Hormone Replacement Therapy

The effects of combining ACTONEL 5 mg daily with conjugated estrogen 0.625 mg daily (N = 263) were compared to the effects of conjugated estrogen alone (N = 261) in a 1-year, randomized, doubleblind study of women ages 37 to 82 years, who were on average 14 years postmenopausal. The BMD results for this study are presented in Table 5.

Table 5 Percent Change from Baseline in BMD After 1 Year of Treatment

Histology/Histomorphometry

Bone biopsies from 53 postmenopausal women were obtained at endpoint. Patients had received ACTONEL 5 mg plus estrogen or estrogen-alone once daily for 1 year. Histologic evaluation (N = 47) demonstrated that the bone of patients treated with ACTONEL plus estrogen was of normal lamellar structure and normal mineralization. The histomorphometric parameter mineralizing surface, a measure of bone turnover, was assessed based upon baseline and post-treatment biopsy samples from 12 patients treated with ACTONEL plus estrogen and 12 treated with estrogen-alone. Mineralizing surface decreased in both treatment groups (median percent change: ACTONEL plus estrogen, -79%; estrogenalone, -50%), consistent with the known effects of these agents on bone turnover.

Men With Osteoporosis

The effects of ACTONEL 35 mg once-a-week on BMD were examined in a 2-year, double-blind, placebo-controlled, multinational study in 285 men with osteoporosis (ACTONEL, N = 192). The patients had a mean age of 61 years (range 36 to 84 years) and 95% were Caucasian. At baseline, mean lumbar spine T-score was -3.2 and mean femoral neck T-score was -2.4. All patients in the study had either, 1) a BMD T-score less than or equal to -2 at the femoral neck and less than or equal to -1 at the lumbar spine, or 2) a BMD T-score less than or equal to -1 at the femoral neck and less than or equal to -2.5 at the lumbar spine. All patients were supplemented with calcium 1000 mg/day and vitamin D 400 to 500 international units/day. ACTONEL 35 mg once-a-week produced significant mean increases in BMD at the lumbar spine, femoral neck, trochanter, and total hip compared to placebo after 2 years of treatment (treatment difference: lumbar spine, 4.5%; femoral neck, 1.1%; trochanter, 2.2%; total proximal femur, 1.5%).

Glucocorticoid-Induced Osteoporosis

Bone Mineral Density

Two 1-year, double-blind, placebo-controlled trials in patients who were taking greater than or equal to 7.5 mg/day of prednisone or equivalent demonstrated that ACTONEL 5 mg daily was effective in the prevention and treatment of glucocorticoid-induced osteoporosis in men and women who were either initiating or continuing glucocorticoid therapy. The efficacy of ACTONEL therapy for glucocorticoid-induced osteoporosis beyond one year has not been studied.

The prevention study enrolled 228 patients (ACTONEL 5 mg, N = 76) (18 to 85 years of age), each of whom had initiated glucocorticoid therapy (mean daily dose of prednisone 21 mg) within the previous 3 months (mean duration of use prior to study 1.8 months) for rheumatic, skin, and pulmonary diseases. The mean lumbar spine BMD was normal at baseline (average T-score -0.7). All patients in this study received supplemental calcium 500 mg/day. By the third month of treatment, and continuing through the year-long treatment, the placebo group experienced losses in BMD at the lumbar spine, femoral neck, and trochanter, while BMD was maintained or increased in the ACTONEL 5 mg group. At each skeletal site there were statistically significant differences between the placebo group and the ACTONEL 5 mg group at all timepoints (Months 3, 6, 9, and 12). The treatment differences increased with continued treatment. Although BMD increased at the distal radius in the ACTONEL 5 mg group compared to the placebo group, the difference was not statistically significant. The differences between placebo and ACTONEL 5 mg after 1 year were 3.8% at the lumbar spine, 4.1% at the femoral neck, and 4.6% at the trochanter, as shown in Figure 3. The results at these skeletal sites were similar to the overall results when the subgroups of men and postmenopausal women, but not premenopausal women, were analyzed separately. ACTONEL was effective at the lumbar spine, femoral neck, and trochanter regardless of age (less than 65 vs. greater than or equal to 65), gender, prior and concomitant glucocorticoid dose, or baseline BMD. Positive treatment effects were also observed in patients taking glucocorticoids for a broad range of rheumatologic disorders, the most common of which were rheumatoid arthritis, temporal arteritis, and polymyalgia rheumatica.

The treatment study of similar design enrolled 290 patients (ACTONEL 5 mg, N = 100) (19 to 85 years of age) with continuing, long-term (greater than or equal to 6 months) use of glucocorticoids (mean duration of use prior to study 60 months; mean daily dose of prednisone 15 mg) for rheumatic, skin, and pulmonary diseases. The baseline mean lumbar spine BMD was low (1.63 SD below the young healthy population mean), with 28% of the patients more than 2.5 SD below the mean. All patients in this study received supplemental calcium 1000 mg/day and vitamin D 400 international units/day.

After 1 year of treatment, the BMD of the placebo group was within 1% of baseline levels at the lumbar spine, femoral neck, and trochanter. ACTONEL 5 mg increased BMD at the lumbar spine (2.9%), femoral neck (1.8%), and trochanter (2.4%). The differences between ACTONEL and placebo were 2.7% at the lumbar spine, 1.9% at the femoral neck, and 1.6% at the trochanter as shown in Figure 4. The differences were statistically significant for the lumbar spine and femoral neck, but not at the femoral trochanter. ACTONEL was similarly effective on lumbar spine BMD regardless of age (less than 65 vs. greater than or equal to 65), gender, or pre-study glucocorticoid dose. Positive treatment effects were also observed in patients taking glucocorticoids for a broad range of rheumatologic disorders, the most common of which were rheumatoid arthritis, temporal arteritis, and polymyalgia rheumatica.

Figure 3: Change in BMD from Baseline Patients Recently Initiating Glucocorticoid Therapy

Figure 4: Change in BMD from Baseline Patients on Long -Term Glucocorticoid Therapy

Vertebral Fractures

In the prevention study of patients initiating glucocorticoids, the incidence of vertebral fractures at 1 year was reduced from 17% in the placebo group to 6% in the ACTONEL group. In the treatment study of patients continuing glucocorticoids, the incidence of vertebral fractures was reduced from 15% in the placebo group to 5% in the ACTONEL group (Figure 5). The statistically significant reduction in vertebral fracture incidence in the analysis of the combined studies corresponded to an absolute risk reduction of 11% and a relative risk reduction of 70%. All vertebral fractures were diagnosed radiographically; some of these fractures also were associated with symptoms (that is, clinical fractures).

Figure 5: Incidence of Vertebral Fractures in Patients Initiating or Continuing Glucocorticoid Therapy

Histology/Histomorphometry

Bone biopsies from 40 patients on glucocorticoid therapy were obtained at endpoint. Patients had received placebo or daily ACTONEL (2.5 mg or 5 mg) for 1 year. Histologic evaluation (N = 33) showed that bone formed during treatment with ACTONEL was of normal lamellar structure and normal mineralization, with no bone or marrow abnormalities observed. The histomorphometric parameter mineralizing surface, a measure of bone turnover, was assessed based upon baseline and post-treatment biopsy samples from 10 patients treated with ACTONEL 5 mg. Mineralizing surface decreased 24% (median percent change) in these patients. Only a small number of placebo-treated patients had both baseline and post-treatment biopsy samples, precluding a meaningful quantitative assessment.

Treatment Of Paget’s Disease

The efficacy of ACTONEL was demonstrated in 2 clinical studies involving 120 men and 65 women. In a double-blind, active-controlled study of patients with moderate-to-severe Paget’s disease (serum alkaline phosphatase levels of at least 2 times the upper limit of normal), patients were treated with ACTONEL 30 mg daily for 2 months or Didronel (etidronate disodium) 400 mg daily for 6 months. At Day 180, 77% (43/56) of ACTONEL-treated patients achieved normalization of serum alkaline phosphatase levels, compared to 10.5% (6/57) of patients treated with Didronel (p less than 0.001). At Day 540, 16 months after discontinuation of therapy, 53% (17/32) of ACTONEL-treated patients and 14% (4/29) of Didronel-treated patients with available data remained in biochemical remission.

During the first 180 days of the active-controlled study, 85% (51/60) of ACTONEL-treated patients demonstrated a greater than or equal to 75% reduction from baseline in serum alkaline phosphatase excess (difference between measured level and midpoint of the normal range) with 2 months of treatment compared to 20% (12/60) in the Didronel-treated group with 6 months of treatment (p less than 0.001). Changes in serum alkaline phosphatase excess over time (shown in Figure 6) were significant following only 30 days of treatment, with a 36% reduction in serum alkaline phosphatase excess at that time compared to only a 6% reduction seen with Didronel treatment at the same time point (p less than 0.01).

Figure 6: Mean Percent Change from Baseline in Serum Alkaline Phosphatase Excess by Visit

Response to ACTONEL therapy was similar in patients with mild to very severe Paget’s disease. Table 6 shows the mean percent reduction from baseline at Day 180 in excess serum alkaline phosphatase in patients with mild, moderate, or severe disease.

Table 6 Mean Percent Reduction from Baseline at Day 180 in Total Serum Alkaline Phosphatase Excess by Disease Severity

Response to ACTONEL therapy was similar between patients who had previously received anti-pagetic therapy and those who had not. In the active-controlled study, 4 patients previously non-responsive to 1 or more courses of anti-pagetic therapy (calcitonin, Didronel) responded to treatment with ACTONEL 30 mg daily (defined by at least a 30% change from baseline). Each of these patients achieved at least 90% reduction from baseline in serum alkaline phosphatase excess, with 3 patients achieving normalization of serum alkaline phosphatase levels.

Histomorphometry of the bone was studied in 14 patients with bone biopsies: 9 patients had biopsies from pagetic bone lesions and 5 patients from non-pagetic bone. Bone biopsy results in non-pagetic bone did not reveal osteomalacia, impairment of bone remodeling, or induction of a significant decline in bone turnover in patients treated with ACTONEL.

Medication Guide

PATIENT INFORMATION

ACTONEL®
(AK-toh-nel)
(risedronate sodium) Tablets

Read the Medication Guide that comes with ACTONEL® before you start taking it and each time you get a refill. There may be new information. This Medication Guide does not take the place of talking with your doctor about your medical condition or your treatment. Talk to your doctor if you have any questions about ACTONEL, there may be new information about it.

What is the most important information I should know about ACTONEL?

ACTONEL can cause serious side effects including:

1. Esophagus problems

2. Low calcium levels in your blood (hypocalcemia)

3. Severe jaw bone problems (osteonecrosis)

4. Bone, joint, or muscle pain

5. Unusual thigh bone fractures

1. Esophagus problems .

Some people who take ACTONEL may develop problems in thees ophagus (the tube that connects the mouth and the stomach). These problems include irritation, inflammation, or ulcers of the esophagus which may sometimes bleed.

o It is important that you take ACTONEL exactly as prescribed to help lower your chance of getting esophagus problems. (See the section “How should I take ACTONEL?”)

o Stop taking ACTONEL and call your doctor right away if you get chest pain, new or worsening heartburn, or have trouble or pain when you swallow.

2. Low calcium levels in your blood (hypocalcemia).

ACTONEL may lower the calcium levels in your blood. If you have low blood calcium before you start taking ACTONEL, it may get worse during treatment. Your low blood calcium must be treated before you take ACTONEL. Most people with low blood calcium levels do not have symptoms, but some people may have symptoms. Call your doctor right away if you have symptoms of low blood calcium such as:

o Spasms, twitches, or cramps in your muscles

o Numbness or tingling in your fingers, toes, or around your mouth

Your doctor may prescribe calcium and vitamin D to help prevent low calcium levels in your blood, while you take ACTONEL. Take calcium and vitamin D as your doctor tells you to.

3. Severe jaw bone problems (osteonecrosis).

Severe jaw bone problems may happen when you take ACTONEL. Your doctor should examine your mouth before you start ACTONEL. Your doctor may tell you to see your dentist before you start ACTONEL. It is important for you to practice good mouth care during treatment with ACTONEL.

4. Bone, joint, or muscle pain.

Some people who take ACTONEL develop severe bone, joint, or muscle pain.

5. Unusual thigh bone fractures .

Some people have developed unusual fractures in their thigh bone. Symptoms of a fracturemay include new or unusual pain in your hip, groin, or thigh.

Call your doctor right away if you have any of these side effects.

What is ACTONEL?

ACTONEL is a prescription medicine used to:

· Treat or prevent osteoporosis in women after menopause. ACTONEL helps increase bone mass and

· helps reduce the chance of having a spinal or non-spinal fracture (break).

· Increase bone mass in men with osteoporosis.

· Treat or prevent osteoporosis in either men or women who are taking corticosteroid medicines.

· Treat certain men and women who have Paget’s disease of the bone.

It is not known how long ACTONEL works for the treatment and prevention of osteoporosis. You should see your doctor regularly to determine if ACTONEL is still right for you.

ACTONEL is not for use in children.

Who should not take ACTONEL?

Do not take ACTONEL if you:

· Have certain problems with your esophagus, the tube that connects your mouth with your stomach

· Cannot stand or sit upright for at least 30 minutes

· Have low levels of calcium in your blood

· Are allergic to ACTONEL or any of its ingredients. A list of ingredients is at the end of this leaflet.

What should I tell my doctor before taking ACTONEL?

Before you start ACTONEL, be sure to talk to your doctor if you:

· Have problems with swallowing

· Have stomach or digestive problems

· Have low blood calcium

· Plan to have dental surgery or teeth removed

· Have kidney problems

· Have been told you have trouble absorbing minerals in your stomach or intestines (malabsorption syndrome)

· Are pregnant, or plan to become pregnant. It is not known if ACTONEL can harm your unborn baby.

· Are breastfeeding or plan to breastfeed. It is not known if ACTONEL passes into your milk and may harm your baby.

Especially tell your doctor if you take:

· antacids

· aspirin

· Nonsteroidal Anti-Inflammatory (NSAID) medicines

Tell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins and herbal supplements. Certain medicines may affect how ACTONEL works.

Know the medicines you take. Keep a list of them and show it to your doctor and pharmacist each time you get a new medicine.

How should I take ACTONEL?

· Take ACTONEL exactly as your doctor tells you. Your doctor may change your dose of ACTONEL if needed.

· ACTONEL works only if taken on an empty stomach.

· Take 1 ACTONEL tablet, after you get up for the day and before taking your first food, drink, or other medicine.

· Take ACTONEL while you are sitting or standing.

· Do not chew or suck on a tablet of ACTONEL.

· Swallow ACTONEL tablet with a full glass (6 to 8 ounces) of plain water only.

· Do not take ACTONEL with mineral water, coffee, tea, soda, or juice.

After swallowing ACTONEL tablet, wait at least 30 minutes:

· Before you lie down. You may sit, stand or walk, and do normal activities like reading.

· Before you take your first food or drink except for plain water.

· Before you take other medicines, including antacids, calcium, and other supplements and vitamins.

Do not lie down for at least 30 minutes after you take ACTONEL and after you eat your first food of the day.

If you miss a dose of ACTONEL, do not take it later in the day. Take your missed dose the next morning and then return to your normal schedule. Do not take 2 doses at the same time.

If you miss more than 2 doses of ACTONEL in a month, call your doctor for instructions.

If you take too much ACTONEL, call your doctor. Do not try to vomit. Do not lie down.

What are the possible side effects of ACTONEL?

ACTONEL may cause serious side effects:

· See “What is the most important information I should know about ACTONEL?”

The most common side effects of ACTONEL are:

· pain, including back and joint pain

· stomach area (abdominal) pain

· heartburn

You may get allergic reactions, such as hives, swelling of your face, lips, tongue, or throat.

Tell your doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of ACTONEL. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800- FDA-1088.

How should I store ACTONEL?

· Store ACTONEL at room temperature, 68° F to 77° F (20° C to 25° C).

Safely throw away medicine that is out of date or no longer needed.

Keep ACTONEL and all medicines out of the reach of children.

General information about the safe and effective use of ACTONEL.

Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use ACTONEL for a condition for which it was not prescribed. Do not give ACTONEL to other people, even if they have the same symptoms you have. It may harm them.

This Medication Guide summarizes the most important information about ACTONEL. If you would like more information, talk with your doctor. You can ask your doctor or pharmacist for information about ACTONEL that is written for health professionals.

For more information, go to www.ACTONEL.com or call 1-800-521-8813.

What are the ingredients in ACTONEL?

Active ingredient: risedronate sodium

Inactive ingredients in all dose strengths: crospovidone, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, silicon dioxide, titanium dioxide.

Inactive ingredients specific to a dose strength: 5 mg—ferric oxide yellow, lactose monohydrate; 30 mg—lactose monohydrate; 35 mg—ferric oxide red, ferric oxide yellow, lactose monohydrate; 75 mg—ferric oxide red; 150 mg—FD&C blue #2 aluminum lake.